The CSS var () function inserts custom property values

Usage:

var(custom-property-name, value)
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value	describe
custom-property-name	A necessity. The name of the custom property, which must start with –.
value	Optional. Alternate value, used when the attribute does not exist.

When defining a variable in global CSS, prefix the variable name with –. For example: – themeColor
Var (–themeColor) when called elsewhere

/ / app. WXSS
page {
    --themeColor: #eb4450;
}

// index. WXSS
color: var(--themeColor);
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